Hello,

I am happy to announce release 0.22.0 of Hawkular Metrics. This release is anchored by performance and compression enhancements.

Here is a list of major changes:

• Compression
  • Prevent OutOfMemoryError on Cassandra when compression job runs (HWKMETRICS-520)
  • Avoid compression job executing in a loop when execution falls behind (HWKMETRICS-536)
  • Avoid future executions of compression job from not running if Cassandra is shutdown abruptly (HWKMETRICS-518)
  • Added a flag to disable the compression job; the data will be persisted and retrieved without compression (HWKMETRICS-524)
  • The block size for compression is now configurable (HWKMETRICS-545)
  • The compression job can now be triggered manually (HWKMETRICS-502)
• Server Clustering
  • The external alerter is now cluster-aware and will not process the same request on multiple nodes (HWKMETRICS-515)
  • Schema updates are correctly applied when multiple servers are started at the same time (HWKMETRICS-514)
  • Added Cassandra connection information to the status page and created an admin version with detailed Cassandra cluster information (HWKMETRICS-526)
  • Internal system metrics are now persisted under admin tenant; this gives a good overview of the current system load (HWKMETRICS-550)
• REST API
  • Added endpoint to allow fetching of available tag names (HWKMETRICS-532)
  • Fixed an issue where the API would report an internal server error on invalid query (HWKMETRICS-543)
• Hawkular Alerting - Updates
  • End to end performance enhancements
  • Major improvements to REST API documentation
  • New cross-tenant endpoints for for fetching alerts
  • Email and webhook action plugins are now packaged in the main distribution (HWKMETRICS-552)

Hawkular Alerting - included

• Version 1.4.0
• Project details and repository: Github
• Documentation: REST API Documentation, Examples, Developer Guide

Hawkular Metrics Clients

• Python: https://github.com/hawkular/hawkular-client-python
• Go: https://github.com/hawkular/hawkular-client-go
• Ruby: https://github.com/hawkular/hawkular-client-ruby
• Java: https://github.com/hawkular/hawkular-client-java

Release Links

Github Release: https://github.com/hawkular/hawkular-metrics/releases/tag/0.22.0

JBoss Nexus Maven artifacts:
http://origin-repository.jboss.org/nexus/content/repositories/public/org/hawkular/metrics/

Jira release tracker:
https://issues.jboss.org/projects/HWKMETRICS/versions/12332012

A big "Thank you" goes to John Sanda, Matt Wringe, Michael Burman, Joel Takvorian, Jay Shaughnessy, Lucas Ponce, and Heiko Rupp for their project contributions.


Thank you,
Stefan Negrea